1812997886 has 8 divisors (see below), whose sum is σ = 3107996400. Its totient is φ = 776999088.

The previous prime is 1812997883. The next prime is 1812997889. The reversal of 1812997886 is 6887992181.

It is an interprime number because it is at equal distance from previous prime (1812997883) and next prime (1812997889).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1812997886² = 6573922669280937992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812997883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64749911 + ... + 64749938.

It is an arithmetic number, because the mean of its divisors is an integer number (388499550).

Almost surely, 2^1812997886 is an apocalyptic number.

1812997886 is a deficient number, since it is larger than the sum of its proper divisors (1294998514).

1812997886 is a wasteful number, since it uses less digits than its factorization.

1812997886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129499858.

The product of its digits is 3483648, while the sum is 59.

The square root of 1812997886 is about 42579.3128878332. The cubic root of 1812997886 is about 1219.3613709442.

The spelling of 1812997886 in words is "one billion, eight hundred twelve million, nine hundred ninety-seven thousand, eight hundred eighty-six".